Chip cutter



E. J. FINEGAN Nov. 13, 1934.

CHIP CUTTER Filed April 29. 1932 Q I Q QM/ Ms Cittornegs Patented Nov.13, 1934 UNITED STATES CHIP CUTTER Ellwood J. Finegan, Nekoosa, Wis.,assignor of one-half to Michael J. Power, Nekoosa, 'Wis.

Application April 29 1932, Serial No. 08,164

7 Claims.

This invention relates to improvements in chip cutters.

It is the primary object of the invention to provide a novel andimproved chip cutter which will operate more effectively than existingdevices for breaking and separating the fibers of wood chips tofacilitate the entry of digesting liquids used in the manufacture ofpulp.

'It is a further object of the invention to pro-.- vide a novel andimproved mechanical organization in which few parts are required, saidparts being adapted for economical manufacture, repair, replacement andmaintenance.

It is a further object of the invention toprovide a novel and improvedmechanical assembly of the component elements of the machine whereby theindividual crushing rolls are freev to yield with respect to each otherwithout destroying the driving connection therebetween and withoutdeparting to any great degree from a predetermined center line or lineof bite.

In the drawing:

Figure l is a plan view of the device embodying the invention.

Figure 2 is a side elevation of the device with a portion broken away toexpose a stripping finger employed in connection with each of the rolls.

Figure .3 is an enlarged detail view showing in fragmentary longitudinalsection the construction of the rolls and the manner in which theyinteract.

Like parts are identified by the same reference characters throughoutthe several views.

Slidably movable to and from each other on a bed frame 4 are sub-framesor carriages 5 and 6, each of which is provided at 7 and 8 with bearingsfor the respective roll shafts 9 and 10.

The roll shafts are extended at opposite sides of the machine to receivepulleys 11 and 12 respectively, each of the pulleys preferably havingmultiple grooves. The pulleys are separately driven by individual motors15 and 16 to which they are individually connected by belts 17 and 18.

The two carriages or sub-frames 5 and 6 are connected at each side ofthe machine by tension bolts 19 suitably headed at both ends andprovided with compression springs 20 and 21 engaging the outsideportions of the respective carriages, whereby resiliently to oppose theseparation of the carriages or sub-frames.

The extent to which the carriages or subframes may approach each otheris defined by set screws 22 threadedly engaged with one of the carriagesand provided with lock nuts 23 to maintain them in adjustment. The headsOf. the set screws will be engaged by the other carriage to define theminimum separation of the carriages.

-It will be observed that the carriages or subframes 5 and 6 floatfreely on the base frame 4, each of them being free to move in eitherdirection on-the bed. They are, however, roughly centered on the bedframe by means of a centering lug illustrated at 25 which preventseither carriage from moving across the center line to the portion ofthebed frame occupied by the other carriage. The carriages are maintainedin their proper position relatively to each other, however, by the setscrew- 22, tension rods 19, springs 20 and 21, quite independently ofthe centering lug.

:Each of the shafts 9 and 10 carries a cylinder 30. The. respectivecylinders are each provided with one. or more. longitudinal keyways 31containing keys 32. Upon each cylinder is assembled a set of replaceablerings of alternately varying. form. Plain annuli such as that shown at34 alternate with toothed annuli such as that shown. at 35, thearrangement being such that the toothed annuli of the respectivecylinders are staggered to register with plain annuli of the oppositecylinders. Thus, the teeth of annuli 35 overlap each other as clearlyshown in Fig. 3, whereby very effectively to bend, crush and distortchips fed between the cylinders.

In addition to the bending and crushing action produced by the staggeredand overlapping teeth of annuli 35, there is also a crushing or cuttingaction of the teeth upon chips confined against the opposed cylindricalsurface of the associated plain annulus 34. As shown in Fig. 3, eachtooth in the course of its rotation on one of the drums or cylindersapproaches very closely to the cylindrical surfaces of the oppositeannulus 34 on the other drum. Any portion of a chip caught beneath oneof these teeth is practically severed, and this action of the teeth ismore effective in opening up the fibers for the digesting action of pulpliquors than is the more usual action produced by the mere alternatingand overlapping teeth.

In the event that the teeth require sharpening or replacement it is asimple matter, because of the construction herein disclosed, to removeeither one of the complete roll assemblies from the machine and to stripoff and replace any desired number of the rings 34 or 35.

In view of the rolls between the teeth of rings and the cylindricalsurfaces of rings 34, there is some tendency for chips to become lodgedbetween the consecutive spaced rings 35 of any given row. To removechips which adhere to the rolls, I prefer to employ stripping fingerssuch as those shown at 3'7. These may conveniently be mounted on abracket made of a flattened cross shaft at 38. Preferably, one of thefingers will contact the surface of each ring 34 between the toothedrings 35 at either side thereof.

I claim:

1. In a chip cutter, the combination witha pair of co-acting rolls andva bed frame, of sub-frames individually supporting the respective rollsand fioatingly mounted for sliding movement to, and from each other onthe bed frame, means distinct from said bed frame opposing theseparation of said sub-frames independently of their position on saidbed frame, and meanson, the respectivesub-frames for individually.d'rivingflthe respective rolls.

2. In a chip cutter, the combination with a pair of co-acting rolls anda bed frame, of unitaryv sub-frames individually supporting therespective rolls and floatingly mounted for sliding movement to and fromeach other on the bed frame, means independent of said bedframe opposingthe separation of said sub-frames, and means on the respectivesub-frames for individually driving the respective rolls, means forlimiting the approach. of the sub-frames toward each other, and; meansfor limiting the movement of each sub-frame on the bed. frame toward theportion of the bed frame normally occupied by the other sub-frame.

3'. In a chip cutter, the. combination with a bed frame,- of a pluralityof sub-frames slidably mounted on the bed frame for movement to and fromeach other, resilient tension means connecting the sub-frames with eachother, independently 'of said bed frame whereby to oppose their relativeseparation, a. stop on said bed frame positioned between said sub-framesfor limiting the movement of each sub-frame toward. the normal positionof the. other chip cutting rolls individually supported by therespective sub-frames and provided. with individual drivingmeans on saidsub-frames, and staggered owerlapping teeth on each of said rollsinteracting with untoothed portions of the companion roll.

4. In a chip cutter, the combination with a bed frame, of a pair ofsub-frames slidable respectively on said bed frame, a stop on said bedframe positioned between the sub-frames for limiting the movement ofeach sub-frame toward the normal position of the other, a, stop on oneof said sub-frames engageable with the other sub-frame for limiting theapproach of the sub-frames to- Ward each other, and resilient tensionmeans connecting the sub-frames independently of the bed frame.

5. In a chip cutter, the combination with a bed frame, of a pair of.sub-frames slidable respectively on said: bed frame, a stop on said bedframe positioned between the sub-frames for limiting the movement ofeach sub-frame toward the norma]; position of the other, a stop on oneof said sub-frames engageable with the other sub-frame for limiting:the; approach. of the sub-frames toward each other, resilient tensionmeans connecting: the suh-frames independently of the bed frame, chipcutting. rolls each supported by a sub frame, and individual driving.means for each roll supportedby the: bed, frame.

In a. chip cutter, the combination with a bed frame, of a pair ofsub-framesaslidable respectively" on said bed frame, a stop on, one ofsaid suh-frames engageable with. the other sub-frame for limiting theapproach of said sub-frames: toward each other, and resilient;tension-means connecting the sub-frames independently of the bediframe;1

In, In a chip cutter, the combination with a bed frame, of a pair ofsub-iramesslidable respectively on said hedirama. a stop on said bedframe positioned between the sub-frames for limiting the. movement of:each sub-frame toward the: normalv position of the other, and resilienttension means connecting the sub-frames independently of the bed frame.f

- FINEGAN.

